Concentrating table



Apr, 24, 1923.

. 1,452,969 c. c. HEBBARD V GONCENTRATING TABLE Filed May 18 1921 2 Sheets-Sheet 1 gwuwwtoz am ezzmaz Apr. 24, 1923.

' c. c. HEBBARD CONCENTRATING TABLE 1921 2 Sheets-Sheet 2 Filed May 18 Patented Apr. 24, 1923.

- marten stares earner creme.

CHARLES C. HEIBBARD, OF JOPLIN, MISSOURI, -ASSIGNOR OF ONE-THIRD T0 EDVARD H. SHACKELFORD AND ONE-THIRD TU OTTO RUHL, BOTH OF J OPLIN, MISSOURI.

CONCENTRATING TABLE.

Application filed. May 18,

T 0 all whom it may concern:

Be it known that 1, CHARLES C. Hana-nu), a citizen of the United States, residing at Joplin, in the county of Jasper'and State of Missouri, have invented certain new and useful Improvements in Concentrating Tables, of which the following is a specification, reference being had to the accompany ing drawings.

This invention relates to concentrating tables, and particularly to the head motions therefor whereby the table is given a longitudinal reciprocating motion.

The general object of this invention is to provide simple and effective means whereby this longitudinal reciprocation of the table can be secured and-whereby the table may be jarred by impact with a bumping block, and particularly to provide means whereby the length of the stroke of the table may be adjusted so as to secure a stroke of any desired length up to the maximum radius of the eccentric, and whereby this length of stroke of the table may be attained whether there is a light or heavy feed being run on the table, or in other words so construct the table that there will be no increase in the length of stroke with a light feed or any decrease in the length of stroke and of the force of the blow on the bumper if the load is heavy.

A further object is to provide a construction of this character wherein the table s forced forward by means of an eccentric and the bumper block shifted away from the bumper any desired distance, the table and the bumping block being urged forward by means of a spring to cause the forward motion of the table and the impact between the bumping block and the bumper.

And a further object is to provide a mechanism of this character whereby the bumping block carried by the concentrating table may strike the bumper with almost any degree of force desired and at the same time secure a return movement after the impact which is quick at firstand then gradually slows up until at the extreme'end of the back stroke there is a period of comparative rest which allows the pulp on the deck to settle before the next impact" th s variable reciprocating movement combined with the jar given by the impact of the bumping block against the bumper giving the n'iaterial being treat 1921. Serial no. 470,714.

ed a rapid travel on the deck and thus en: abling a table operating with this device to treat a much greater quantity of ore than is possible where only a cam or eccentric is used with differential toggles to produce the movement.

' Another object is to provide a construction of this character wherein a variable reciprocation of the table is secured by the provision of means permitting the table retracting means to move rearward a predetermined distance before exerting any retract-ion on the deck frame of the concentrator.

And another object is to provide a construction of this character having an adjustable spring compressed by a movement of the table away from the bumper and which spring, when released, acts to urge the bumping block into contact with the bumper to give the required ar to the table, and provide a second spring whose tension may be so adjusted as either to causet-he immediate and full retraction of the table and bumper block from the bumper upon a predetermined movement of the power operated actuating means or which, when the tension is relaxed, will permit a certain movement of the power operated means before any retraction of the table is effected.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a fragmentary top plan view of the head motion of a concentrator, the head motion being partly in section;

Figure 2 is a vertical longitudinal sectional view showing the position of the parts when the table is moved forward to its full extent;

Figure 3 is a like view to Figure 2, show ing the position of the parts when the table is retracted and the springs 41 and 58 compressed.

Referring to these drawings, 10 designates the usual frame supporting the concentrating deck, which concentrating deck and frame are of any suitable construction. Adjacent its head end the frame is provided with a relatively heavy transverse beam 11 which, as illustrated, is disposed below the deck of the concentrator and on a level with channel irons 12 which form. the beams of of my present invention.

Mounted upon any suitable foundation a the head end of the concentrating table is the bed 18, and mounted in bearings on this bed is the transverse power shaft 19 having a belt wheel 20 whereby power may be applied to the shaft to rotate it. This shaft passes through a casing designed to be filled with oil and designated generally 21 and having a removable cover, and within this casing and mounted upon the shaft for rotation therewith is disposed an eccentric 22. Surrounding this eccentric is eccentric ring 23 having a yoke 24 extending therefrom, this yoke having avertically disposed aperture or passage 25 defining a cross bar 26, through which there is an aperture 27. The bed is formed to provide upwardly extending abutments 28 connected at their rear ends by a transverse web 29, the rear face of which is vertical. This web 29 constitutes a bumper and may have cushioning material applied thereto or not as desired.

This bumper 29 has a slot 30 through it, through which slot passes the rod 31. This rod at one end passes through a slot 32 formed in the end wall of the casing 21 and the rod is screw-threaded, as at and passes through the aperture 27 in the cross bar 26 of the yoke and is engaged by a nut 34 bearing against the inner face of the cross bar 26. The rod 31 at its end remote from the eccentric is screw-threaded, as at and carries upon it the socket plate 36 which bears against a nut 37 engaging the rod. The intermediate portion of the rod is screwthreaded, as at 38, to engage with a nut 39, and surrounding this portion 38 of the rod is asocketplate 40 confronting the socket plate 36. Disposed between these two plates is the coiled compression spring 41 whose ends engage in sockets in the plates. By turning up the nut 39, it will be obvious that this spring will be compressed toward the plate 36.

The bumper 29 carries upon its ends the rearwardly projecting stud bolts 42, which at one end are screwed into the bumper and which carry the nuts 43. A cross bar 44 which is slotted, as at 45, has perforations at its ends through which the bolts 42 pr this cross bar bearing against the nuts 43, the rod 31 passing through the slot 45 in this cross bar. Attached. to the beam 11 and projecting therefrom toward the operating eccentric parallel to the rod 31 are the longitudinally extending bolts 46 which have nuts 47 holding the bolts in engagement with the beam 11 and which at their opposite ends are screw-threaded, as at 48, for engagement by pairs of nuts 49 between which is clamped the bumper block 50. This bumper block is vertically slotted, as at 51, for the passage of the rod 31 and may be provided upon its inner face with a cushioning layer, as for instance a layer of rul ber 52. This layer of rubber might be mounted either upon the bumper 29 or upon the bumper block 50. The intermediate portions of the bolts 46 are screw-threaded, as at 53, and these portions of the bolts pass loosely through a cross bar 54 held in place upon the bolts by pairs of nuts 55 engaging the screw-threads 53. This cross bar is vertically slotted, as at 56, for the passage of the rod 31. The socket plate 40 bears against one face of this cross ar 54 and a second socket plate 57 bears against the opposite face of the cross bar and confronts the socket plate 44 carried by the bolts 42. Between the socket plate 44 and the socket plate 57 is a coiled compression spring 58. It will be obvious that the pressure of this spring against the cross bar 54 may be increased or diminished by adjusting the nuts 43 and as a consequence adjusting the socket plate 44.

It is obvious that were the deck connected rigidly to the eccentric rod, the deck would travel at the same speed one way as it does the other and that the length of stroke of the table or deck would be equal to the throw of the eccentric, but when this condition is changed and the deck is not so fixed to the eccentric red but springs are arranged as T have arranged them between the table and the eccentric, it is obvious that the speed of travel of the table can be made unequal in one direction at least and the movement of the table less than the throw of the eccentric. It is not possible for the table to travel at any time faster than the eccentric in either direction, but it can go slower for the reason that the eccentric rod is not rigidly connected to the table but moves it only in one direction, that is rearwardly, and that the table is urged in a forward direction by the spring 58. The eccentric can move faster than the table does, in which case the plate 40 will leave the cross bar 54. It is obvious that the table can be stopped in its forward movement, as by the bumping block, without any stoppage of the eccentric, the rod 31 simply moving onward during the complete throw of the eccentric. Thus, for instance, when there is a very weak tension on the spring 58, the bumping block will barely strike the bumper before the eccentric commences its rearward movement,- When,

however, there is a very strong tension on the spring 58, the table will move forward as rapidly as the eccentric rod 31 does and will strike the bumper block with great force. Therefore, it is obvious that by adjusting the tension of spring 58, .the force of the impact can be adjusted within a relatively large range and that a light or hard impact can be secured by properly tensioning spring 58 which governs the speed of the forward movement of the deck.

Assuming that the springs 41 and 58 have had their tensions initially adjusted to secure the required result and that the spring 41 is initially stronger than the spring 58, then as shaft 19 is rotated from the position shown in Figure 1, the eccentric 22 will cause the retraction of rod 31. As rod 81 is drawn rearward, that is away from the deck, itfirst pulls on spring 41. As this spring 41 is initially tensioned to a greater degree than spring 58, it follows that spring 58 will compress and the draft of: the eccentric rod will be communicated to the cross bar 54 and that this rearward movement of the cross bar 54 and of the table and of the spring 41 will continue until the spring 58 has been compressed to a degree wherein it is stronger than spring 41. The point at which spring 58 becomes stronger than spring 41 will depend upon the tension initially given to the spring 58. When this point is reached, say at 1% stroke, the spring 58 becomes stronger than 41 and will stop the rearward movement of the deck and the spring 41 will commence to compress and will continue to be compressed throughout the remaining rearward movement of the eccentric. As the spring 41 compresses, the rod 31 will move rearward and the nut 39 will leave the plate 40, as illustrated in Fig ure 3.

When the ccentric has made a halt revolution and begins its return stroke, the spring 58 will act to return the table to its initial position and cause the bumper block to impact against the bumper with a greater or less degree of force, depending upon the adjustment of the spring 58.

It will be obvious that by regulating the tension of spring 58, it may be compressed relatively slightly and then a full stroke of the table will be secured or the tension on the spring may be such that it will hold the table from further rearward movement after the spring 58 has been (ompressed to a very slight amount and thus a variable stroke is secured which, by adjusting the nut 37', may be. controlled and varied so as to secure a stroke of any desired length up to the maximum stroke allorded by the radius of the eccentric. It is to be understood that the springs 41 and 58 are adjusted relatively to each other. Thus, for instance, assume that deck this is secured by adjusting springs 58 and 41 to give the required length of stroke but if it is then found that the bump against the. buntiping block is not sufficiently hard and the pulp is banking or clogging in the ri'liies on the deck, more tension is placed on spring 58 so as to secure a greater bumping action. This, of course, shortens the length of the stroke and to adjust it again to a if: stroke, the nut 3'? is turned, making spring 41 a little stiffer, as until it is made stiffer the resistance of the spring 41 is not equal to overcoming the added tension put on spring 58.. In this manner it is possible to secure either a light or hard bump and at the same time secure any desired length of stroke by relatively adjusting springs 58 and 41.

By the mechanism which I have described, I am enabled to have the bumping block strike the bumper with almost any desired force and at the same time have a return movement which is quick at first and k, dually slows up until the extreme end of the back stroke is reached, whereupon there is a period of comparative rest, allowing the pulp on the deck to settle before the next impact. This variable reciprocating movement combined with the jar given by the impact between the bumping block and the bumper gives the material being treated a rapid travel on the deck which enables the table to treat a much greater quantity of ore than is possible on tables operated only by a cam. or eccentric combined with the ordinary liiierential toggles.

I am aware that it is not new to provide for the slow forward movement of the table and the quick return which acts to pull the deck from under the pulp on its surface, but in addition to this quick return movement of the deck I also secure a bumping action, stopping the deck suddenly by the impact between the bumping block and the bumper. Of course, the pulp which is under momentum will travel much faster on the deck, censequently securing a much greater tonnage oi pulp and giving a larger amount of concentrates within a given time than when only a diiiierential movement is employed without abumper.

Whilel have illustrated and described an embodiment of my invention which has been found thoroughly eiiective and which'permits the ver close adjustment as to stroke, yet I do not wish to be limited to the details of czmstruction nor to the exact arrangement of the parts, as it is obvious that these might be varied in wide limits without departing from the spirit of the invention.

I claim 1. In a concentrator, the combination with a deck frame mounted for longitudinal reciprocation, at a fixed bu er. a bumping block reciprocated with and operatively conncctcd to the frame, a spring urging the the lmmping block means to but operatiir termittentl against the force of the sp the frame to permit it the sprrc bumper J! 1 .1 c 4. J1 .iOlG iorwai'o unoei he action or and brir the bumper inst the L w s s means per L usL-able me to move re i A... distance before exion on the frame.

ward a ertinga 2. in c a deck ciprocati.

U .ial of fixed bumper, a bump block reciprocating with and operativ connected to "he frail e coacting the bumper, a spring 1 t ward. and the o ng' block against E. bumper, power means for reciprocating the frame and bumping block including a power operated member independently movable with relation to but reciprocating longitudinally the deck, a. member carried by the deck and toward which the power operated member moves on rearward stroke, and a member disposed between the power operated member and the second named member and longitudinally adjustable to thereby adjust the instant at which the power operated member will operatively ene a go to retract the second named member and the deck.

3. In a concentrator, the combination with a deck frame mounted for longitudinal recinrocatiou, of a fixed bumper, a. bumping block reciprocating with and operativelv connected to the frame and coacting with the bumper, a s n" urging the frame forward and the bumping block against the bumper, power operated means for reciprocating the frame and bumping block including a power operated membc 1 movable independently of but reciprocat ng longitudinally of the deck, a member carried by the deck and toward which the power operated member moves on its rearward movement, and a compression 5131111}: disposed between the power operated member and the second named member.

4t. In a concentrator, the combination with a deck frame mounted for longitudinal reciprocation, of a fixed bumper, a bumping block reciprocating with and operatively connected to the frame and coacting with the bumper, a spring urging the frame forward and the bumping block against the bumper, power operated means for TGfllliO- eating the frame and bumping block including power operated member reciprocating longitudinally of the deck frame but independently of the deck frame, a member carried by the deck frame and toward which the power operated member moves on its rearward movement, a compression spring disposed between the power operated member and the second named member, and means for adju'stably increasing or decreasing the tension of said spring.

5. In a concentrator, the combination with a deck frame mounted for longitudinal reciprocation, of a fixed bumper, a bumping block reciprocating with and operatively connected to the frame and coacting with the bumper, a spring urging the frame forward and the bumping block against the bumper, power operated means for reciprocating the frame and bumping block including a power operated member reciprocating longitudinally of the deck frame but movable independently thereof, a member carried by the deck frame and toward which the power operated member moves on its rearward movement, a compression spring operatively mounted at one end upon the rear face of the power operated member, and an adjustable member upon which the opposite end of the sprin is supported, said adjustable member being mounted upon the first named member and adjustable to engage with the second named member, the adjustable member permitting the spring to be compressed to a greater or less extent.

6. In a concentrator, the combination with a deck mounted. for reciprocating movement and a spring urging the deck in a forward direction, of means for reciprocating the deck including a reciprocating member independently movable with relation to the deck and means permitting the reciprocating member to shift the deck with it against the force of said spring during the entire rearward movement of said member or cause said reciprocating member to move idly without affecting the deck during all or a portion of its movement.

'7. In a concentrator, the combination with a deck mounted for reciprocating movement and a spring urging the deck in a forward direction, of means for reciprocating the deck including a reciprocating member independently movable with relation to the deck, means permitting the reciprocating member to shift the deck with it against the force of said spring during the entire rearward movement of the reciprocating member or cause said reciprocating member to move idly without affecting the deck during all or a portion of its movement, and a bumper stopping the forward movement of the deck under the action of the first named spring.

8. In a concentrator. the combination with a deck mounted for reciprocating movement and a spring urging the deck in a forward direction, of means for reciprocating the deck including a reciprocating member movable independently of the deck, a spring operatively engaging the deck and operatively engaged by the reciprocating member and transmitting motion from the reciproeating member to said deck, and means for variably tensioning said spring.

9. A concentrator comprising a deck mounted for reciprocating movement, a longitudinally reciprocatable, power operated member having a constant stroke, a member attached to the deck and forming part thereof and having an opening through which the reciprocatable member freely passes, a fixed bumper, a bumping block carried by the deck and adapted to engage the bumper, a compression spring operatively engaging said second named member and operatively engaged with one end of the reciprocatable member and compressed u pen a retraction of the reciprocatable member, a compression spring disposed on the opposite face of said second named member from the first named spring, and a rigid member against which the opposite end of said last named spring engages and adapted to be compressed upon a movement of the deck from the power operated end of the reciprocating member.

10. In a concentrator, the combination with a deck mounted for reciprocating movement and a spring urging the deck in a forward direction, of means for reciprocating the deck including a power operated reciprocating member independent of the deck, a cross bar through which the member loosely passes and which is operatively connected to the deck, a compression spring disposed between said cross bar and that end of the reciprocating member adjacent the deck. the extremity of the reciprocatin member having means for opera-tively engaging the adjacent end of the spring and having means whereby the tension of the spring may be varied.

11. In a concentrator, the combination with a deck mounted for reciprocating movement and a spring urging the deck in a forward direction, of means for reciprocating the deck including a longitudinally extending reciprocating member independently movable with relation to the deck, a cross bar operatively connected to the deck and through which the reciprocating member loosely passes, a member carried on the end of the reciprocating member adjacent the deck, a coiled compression spring disposed between said member and the cross bar, and a nut having screw-threaded engagement with the end of the reciprocating member adjacent the deck and engaging against. said last named member whereby to adjustably compress the spring.

12. In a concentrator, the combination with a deck mounted for reciprocating movement, of a cross bar operatively connected to the deck, a reciprocating member passing loosely through the cross bar, a compression spring operatively engaging that side of the compression spring bearing cross bar remote from the deck, an abutment against which the end of the spring remote from the deck bears said abutment being adjustable to increase or decrease the tension of the spring, and a compression spring bearing against that face of the cross bar adj acent the deck and operatively engaged with that end of the reciprocating member adjacent the deck.

13. In a concentrator. the combination with a deck mounted for reciprocating movement, of a cross bar operatively connected to the deck, a reciprocating member passing loosely through the cross bar, a compression spring operatively engaging that side of the cross bar remote from the deck, an abutment against which the end of the spring remote from the deck bears, said abutment being adjustable to increase or decrease the tension of the spring, a compression spring bearing against that face of the cross bar adj acent the deck and operatively engaged with that end of the reciprocating member adjacent the deck, and a nut carried on the extremity of the reciprocating member and operatively engaging said spring whereby it may be variably compressed.

7.4. In a concentrator, a deck mounted for reciprocating movement, a pair of rods operatively connected to the deck and ertending rearward therefrom. a cross bar carried upon said rods and moving therewith, a power operated reciprocating member passing loosely through the cross bar, a compression spring operating against one side of the cross bar to urge it in one direction and resist its movement. in the opposite di rection, and a compression spring disposed between the reciprocating member and the other face of said cross bar.

15. In a concentrator. a deck mounted for reciprocating movement, a pair of rods extended from the deck. a cross bar mounted upon said rods and moving therewith. a power operatedreciprocating element passing loosely through the cross bar, a coiled 7 against the rear face of the cross bar. adjustable means supporting the other end of the spring whereby said spring resists the rearward movement of the cross bar and the concentrating table, a coiled compression spring bearing against the opposite face of the cross bar, and means on the extremity of the reciprocating element engaging that end of said spring adjacent the deck, said means being adjustable to adjust the tension of the spring.

16. A concentrator having a deck mounted for reciprocating movement, a pair of rods extending from the deck, a bumping block carried upon said rods for movement therewith, arigid bumper against which the bumping block is adapted to impact, a cross bar mounted upon said rods for movement therewith and disposed between the bumping block and the deck, a power operated reciprocating element passing loosely through the bumpin block, the bumper and the cross bar, a coiled compression spring bearing against the rear face or the cross bar and urging the deck in a torward direction, means carried by the bumper supporting the rear end of the compression sprin and a compression spring bearing against the forward face Oftli) cross bar, the forward end of said compression spring operaively engaging the forward end or the reciprocating element.

17. ii concentrator having a deck mounted for reciprocating increment, a pair of rods extending from the deck, a bumping block carried upon said rods for movement therewith, a rigid ll-umper against which the bumping block is adapted to impact, a cross bar mounted upon said rods for movement therewith and disposed between the bumping block and the deck, power operated reciprocating element passing loosely through the bumping block, the bumper and the cross bar, a coiled compression spring bearing against the rear face oi the cross bar and urging the deck in a forward direction, seat for the other end of the spring adjustably mounted upon the bumper for adjustment toward or from the cross bar to thereby variably tension said spring, a power operated reciprocating element passing through the bumping block, the bumper and said cross bar, a nut carried upon that end 01": the reciprocating element adjacent the deck, and a coiled compression spring disposed between said nut and that face of the cross bar adjac nt the deck and operatively engaged by the nut whereby the last named spring may be variably tensioned.

18. ii concentrator comprising a reciprocatable deck, means for reciprocating the deck including a reciprocatable, longitudi nally extendingrod independently movable with relation to the deck, a member carried by the deck and through which said rod loosely passes, a con'ipression spring disposed between one face of said member and the inner end ot said rod. a nut mounted on the rod adjacent the said member whereby the spring n'iay be compressed and shifted out of engagement with the member, a second compression spring having one end disposed against the opposite iiace ot the said member, and an abutment against which the other end of the second named. spring bears, said abutment being adjustable to thereby control the tension of the spring.

19. A concentrator comprising a reciprocatably mounted deck. a longitudinally reciprocatable operating rod movable independently of the deck, a member attached to the deck and forming part thereoi and through which said rod loosely passes, a

plate loosely mounted upon the rod and adapted to bear against one face oi said member, a nut on the rod adapted to urge e toward the inner extremity of the r rod, a spring support on the inner end of the rod, a coiled compression spring disposed between said plate and the spring support, a second spring operatively engaging the opposite face of said member, and an adjustable abutment against which the opposite end of said last named spring bears.

20. In a concentrating table, a deck, a bumper, a bumping block operatively carried by the deck and coacting with the bumper, means in g the deck and bumping block toward the bumper, and power operated means retracting the bumping block and deck quickly during the initial movement of the bum )ing block away from the bumper and then slowly, but permitting the bumping block and deck to move for ward quickly to bring the bumping block into contact with the bumper whereby to secure a period of rest at the time when the deck is fully retracted to thereby allow the pulp on the deck to settle before the next impact.

21.31 a concentrator, the combination with a deck frame mounted for longitudinal reciprocation, of means urging the deck frame in one direction and power operated means operatively connected to the frame for ii'itermittently retracting it against the urging means, and adjustable means permit ting the retracting means to move rearward a predetermined distance before exerting any retraction on the frame.

29'. In concentrator: a longitudinally shittable concentrating table, a reciprocatable rod associated therewith for reciprocating the same but independently movable with relation to the table. resilient means yieldably connecting; the rod to the table and adjustable as to tension. and means resisting the movement of the deck after it has moved a predetermined distance under the action of said reciprocating means and the resilient means.

23. In concentrator, a longitudinally movable deck, a bumper moving therewith, a fixed bumping block a reciprocating power operated rod. a member carried by the deck and through which the rod passes, compression springs disposed on either side of said member, to one of which springs the reciprocating rod is connected, the other spring: being supported by a relatively fixed abutment, and means for varying the tension of said springs relative to each other.

In testimony whereof I hereunto atlix my signature.

CHARLES C. HEBBARD. 

